Process and apparatus for annealing pipe.



v H. A. BARDEEN.

PROCESS AND APPARATUS FOR ANNEALING PIPE.

APPLICATION FILED APR-.10. I916 Patented Sept. 25,1917.

WTTED TATE PATENT @FFTQE.

HUGH A. BARDEEN, OF VENICE, CALIFORNIA, ASSIGNOR TO THE BARDEEN CORPORATION, OF LOS ANGELES, CALIFORNIA, A CORPORATION OF CALL FORNIA.

PROCESS AND APPARATUS FOR ANNEALING PIPE.

Patented Sept. 25, 1917.

Application filed April 10, 1916. Serial No. 90,268.

To all whom 2'25 may concern:

Be it known that I, HUGH A. BARDEEN, a citizen of the United States, residing at Venice, in the county of Los Angeles and State of California, have invented a new and useful Process and Apparatus for Annealing Pipe, of which the following is a specification.

My invention relates to the art of annealing pipe. In the various uses to which pipe is put, and particularly in its use in connection with the drilling of oil wells, the pipe often becomes crystallized, due to the mechanical shocks and stresses to which it is subjected, and the principal object of my invention is to provide a process and apparatus by which this pipe may be restored to its original condition. This is accomplished by uniformly heating it in a gas or oil fired furnace to a preferred temperature.

Referring to the drawings, which are for illustrative purposes only:

Figure 1 is a sectional elevation through a furnace embodying my invention.

Fig. 2 is a section on a plane represented by the line w 00 of Fig. 1, this plane being viewed in the direction of the arrows.

In the form of the invention illustrated in the drawings, a furnace 11 is provided having a stack 12, this furnace being divided into a blending chamber 13, an annealing chamber 14 and a return chamber 15. The blending chamber 13 and the annealing chamber 14 are separated by a partition 16, and the annealing chamber 14 and the return chamber 15 are separated by a partition 17. An opening 18 is provided in the partition 16 and an opening 19 is provided in the partition 17. An oil burner 20 projects into one end of the blending chamber 13 through a door 21, being controlled by a valve 22. The door 21 is provided with suitable openings through which air for combustion enters the chamber 13. Charging doors 23 and 24 are provided at either end-of the annealing chamber 14 through which the chamber may be charged. The

return chamber 15 connects at one end with the bottom of the stack 12.

The method of operation is as follows: The pipes 30, which are to be annealed, are placed on top of the partition 16 inside the chamber 14, these pipes being inserted through either end of the chamber, one of the doors 23 or 24 being opened for this purpose. The burner 20 is then lighted and the flame from this burner which may be of any suitable construction, fed with any suitable fuel, is fed under the influence of the draft of the chimney 12 through the blending chamber 13 in which it is mixed with outside air, so that a very uniform mixture of heated gases passes upwardly through the opening 18. This mixture passes longitudinally around and through the pipe 30 in the chamber 14. It is necessary to provide the blending chamber 13 so that a uniform gas temperature will be obtained before this gas is used to heat the pipe 30. The gases after passing through the pipe 30 pass upwardly through the opening 19 to the stack 12 through the return chamber 15. The blending chamber 13 and the return chamber 15 being above and below the partitions 16 and 17, these partitions are uniformly heated so that there are no cold furnace walls above or below the pipe to take off the heat therefrom. After the pipe has been left in the annealing chamber 14 for some length of time, it reaches a heat slightly above cherry red, this having been found to be the most advantageous temperature to carry 011 the annealing. After the pipe has been thoroughly annealed, the valve 22 is closed and the whole furnace is allowed to cool down, or thepipe 30 may be removed while hot and allowed to cool outside, a fresh charge being inserted in the furnace.

I claim as my invention 1. In a furnace, the combination of a combustion chamber, a heating chamber and a return chamber, arranged in horizontal parallel arrangement, connections between the heating chamber and the other chambers respectively provided at the opposite ends of equal temperature through and outside of the furnace, and a stack of pipes positioned the pipes in a general direction parallel to horizontally between the said connections their axes. 10 so as to afford passages through and around In testimony whereof, I have hereunto 5 the pipes for the products of combustion. set my hand at Los Angeles, California, this 2. In the process of annealing pipes the 4th day of April, 1916. step of passing heated gases of substantially HUGH A. BARD'EEN.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents. Washington, D. C. 

